PLATE III 



Fig. I. — A white spruce-paper birch forest beside the Koyukuk trail on 

 the low hills north of Xanana. The birches have already lost most of their 

 leaves. September 12, 191 1. 



Fig. 2. — Stunted black spruces at the head of the north fork of the 

 Kuskokwim. None of the trees in the picture are over three inches in 

 diameter, .\pril 28, 191 1. 



